'''The Pennsylvania Horticultural Society''' (PHS) is a nonprofit organization that promotes horticulture-related events and community activities. It is headquartered in Philadelphia
File:PennsylvaniaHorticulturalSociety10.jpg|thumb|left|160px|PHS building, with library on the ground floor.
The Society was founded in 1827 "to establish a Horticultural Society in the City of Philadelphia for the promotion of this interesting and highly influential branch of Science."
The Society hosts the annual Philadelphia Flower Show
, the world's largest indoor flower show. Philadelphia Green
is an urban greening program which promotes improvements in the urban landscape. The Community Greening Award is given annually to caretakers throughout the state in recognition of their beautification efforts.
[[http://www.pennsylvaniahorticulturalsociety.org/events/communitygreeningaward.html Community Greening Award]]